Methods and systems for adaptively cooling combustion chambers in engines

ABSTRACT

The present disclosure is directed to various embodiments of systems and methods for cooling a combustion chamber of an engine. One method includes introducing fuel into the combustion chamber of an engine having an energy transfer device that moves through an intake stroke, a compression stroke, a power stroke, and an exhaust stroke. The method further includes monitoring a temperature of the combustion chamber. When the temperature reaches a predetermined value, the method also includes introducing coolant into the combustion chamber only during at least one of the power stroke and the exhaust stroke of the energy transfer device.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 13/027,170, filed Feb. 14, 2011, now U.S. Pat. No. 8,297,265,which claims priority to and benefit of U.S. Patent Application No.61/304,403, filed Feb. 13, 2010, and is a continuation-in-part of U.S.patent application Ser. No. 12/961,461 filed Dec. 6, 2010. Each of theseapplications is incorporated herein by reference in its entirety. To theextent the foregoing application and/or any other materials incorporatedherein by reference conflict with the disclosure presented herein, thedisclosure herein controls.

TECHNICAL FIELD

The following disclosure relates generally to methods and systems forcooling combustion chambers of internal combustion engines.

BACKGROUND

Fuel injection systems are typically used to inject a fuel spray into aninlet manifold or a combustion chamber of an engine. Fuel injectionsystems have become the primary fuel delivery system used in automotiveengines, having almost completely replaced carburetors since the late1980s. Conventional direct-injection fuel metering systems are typicallyconnected to a pressurized fuel supply, and fuel injectors used in thesefuel injection systems generally inject or otherwise release thepressurized fuel into the combustion chamber at a specific time relativeto the power stroke of the engine. In many engines, and particularly inlarge engines, the size of the bore or port through which the fuelinjector enters the combustion chamber is small. This small portaccordingly limits the size of the components that can be used toactuate or otherwise inject fuel from the injector. Moreover, suchengines also generally have crowded intake and exhaust valve trainmechanisms, further restricting the space available for components ofthese fuel injection systems.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a system configured in accordance withan embodiment of the disclosure.

FIGS. 2A-2E are a series of schematic diagrams of an operational cycleof the system of FIG. 1 configured in accordance with embodiments of thedisclosure.

FIG. 3 is a schematic diagram of a system configured in accordance withanother embodiment of the disclosure.

FIG. 4 is a flow diagram of a method for cooling a combustion chamber ofan engine in accordance with an embodiment of the disclosure.

FIGS. 5 and 6 are schematic diagrams of systems configured in accordancewith additional embodiments of the disclosure.

FIG. 7 is a flow diagram of a method for cooling one or more electricalgenerating components and for cooling a combustion chamber of an enginein accordance with embodiments of the disclosure.

DETAILED DESCRIPTION

The present disclosure describes methods and systems for coolingcombustion chambers of internal combustion engines. For example, severalof the embodiments described below are directed generally to systems andmethods that can inject a first fuel into a combustion chamber andadaptively a second fuel or coolant based on combustion chamberconditions. The second fuel or coolant produces cooling in thecombustion chamber. Certain details are set forth in the followingdescription and in FIGS. 1-7 to provide a thorough understanding ofvarious embodiments of the disclosure. However, other details describingwell-known structures and systems often associated with internalcombustion engines, injectors, igniters, and/or other aspects ofcombustion systems are not set forth below to avoid unnecessarilyobscuring the description of various embodiments of the disclosure.Thus, it will be appreciated that several of the details set forth beloware provided to describe the following embodiments in a mannersufficient to enable a person skilled in the relevant art to make anduse the disclosed embodiments. Several of the details and advantagesdescribed below, however, may not be necessary to practice certainembodiments of the disclosure.

Many of the details, dimensions, angles, shapes, and other featuresshown in the Figures are merely illustrative of particular embodimentsof the disclosure. Accordingly, other embodiments can have otherdetails, dimensions, angles, and features without departing from thespirit or scope of the present disclosure. In addition, those ofordinary skill in the art will appreciate that further embodiments ofthe disclosure can be practiced without several of the details describedbelow. Furthermore, many features of the disclosure illustrated in theFigures are shown schematically.

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment of the present disclosure. Thus, theoccurrences of the phrases “in one embodiment” and “in an embodiment” invarious places throughout this specification are not necessarily allreferring to the same embodiment. Furthermore, the particular features,structures, or characteristics described with reference to a particularembodiment may be combined in any suitable manner in one or more otherembodiments.

1. Systems and Methods for Adaptively Cooling Combustion Chambers

FIG. 1 is a schematic diagram of a system 100 configured in accordancewith an embodiment of the disclosure for adaptively cooling or limitingthe peak operating temperature of a combustion chamber 106. In theillustrated embodiment, the system 100 includes a portion of an engine101 (e.g., a two or four stroke engine) having at least onereciprocating energy transfer device or piston 108 that moves at leastpartially within the corresponding combustion chamber 106. The system100 also includes one or more air flow valves 110 (identifiedindividually as a first valve 110 a and a second valve 110 b) that areoperable to allow air flow to enter and exhaust gases to exit thecombustion chamber 106. For example, the first valve 110 a can be anintake valve that allows inlet air flow to enter the combustion chamber106 via a first or intake passage 109 a, and the second valve 110 b canbe an exhaust valve that allows air flow and/or exhaust to exit thecombustion chamber 106 via a second or exhaust passage 109 b. Althoughtwo valves are shown in FIG. 1A, one of ordinary skill in the art willappreciate that the system can include more than two valves 110.

The system 100 further includes an integrated injector igniter 102(“injector 102”) that is configured to inject fuel and/or coolant intothe combustion chamber 106, as well as to ignite the fuel and/or coolantin the combustion chamber 106. In certain embodiments, the injector caninclude any of the features of the injectors described in U.S. patentapplication Ser. No. 12/961,461, entitled “INTEGRATED FUEL INJECTORIGNITERS CONFIGURED TO INJECT MULTIPLE FUELS AND/OR COOLANTS ANDASSOCIATED METHODS OF USE AND MANUFACTURE,” filed Dec. 6, 2010, andincorporated herein by reference in its entirety. In other embodiments,the injector 102 can include the features of any of the integratedinjector igniters described in the co-pending patent applicationsincorporated by reference in their entireties above. For example, theinjector 102 can include one or more integrated ignition features (e.g.,for initiating a spark, plasma, or other suitable igniting event).According to embodiments of the present disclosure and as described indetail below, the injector 102 can also adaptively inject two or morefuels, coolants, or combinations of fuels and coolants into thecombustion chamber 106 during operation. As used herein, the termcoolant can include any temperature controlling fluid (e.g., gas orliquid) that produces cooling in the combustion chamber 106 (e.g.,lowering a temperature in the combustion chamber and/or transferringheat away from components of the combustion chamber 106). In oneembodiment, for example, a coolant can include non-combusting fluid. Inother embodiments, however, a coolant can include a fuel that ignitesand/or combusts at a lower temperature than another fuel that ignitesand/or combusts in combustion chamber 106 prior to the injection of thecoolant. In still further embodiments, a coolant can be a hydrogenouscoolant (e.g., a hydrogen containing coolant). As described in detailbelow, the injector 102 can be controlled to adaptively adjust thepattern and/or frequency of the fuel/coolant injections based onproperties in the combustion chamber 106.

In the embodiment shown in FIG. 1, the system 100 also includes a numberof sensing and/or computing devices for adaptively controlling the fueland/or coolant delivery and ignition in the combustion chamber 106. Forexample, the injector 102 can include one or more sensors that detectand communicate combustion chamber properties. More specifically, theinjector 102 can include one or more fiber optic elements located on adistal end portion of the injector 102 exposed to an interface of thecombustion chamber 106. As described in accordance with variousembodiments herein, these sensors can also include various means anddevices for measuring combustion chamber temperature and pressureincluding utilization of high frequency strobe of infrared IR, visible,and/or UV light transmitted by the fiber optic portion of the injector102. For example, the means for measuring combustion chamber temperatureand/or pressure can include a Fabry-Perot interferometer. In otherembodiments, the temperature and/or pressure profiles within thecombustion chamber 106 can be determined as a function of time or otherparameters that can be measured using other types of suitabletemperature and/or pressure sensors known in the art. Such temperaturesensors can include, for example, various types of thermocouple,resistive, and IR devices, and such pressure sensors can include, forexample, various types of transducer and piezoelectric devices.

In the illustrated embodiment, temperature and/or pressure data (orother combustion chamber properties) from the combustion chamber 106 canbe processed by an optional sensing module 112 (shown in broken lines).Such processing can include, for example, filtering, converting, and/orformatting the data before transmitting it to a computer 114. Thecomputer 114 can include one or more processors 116 for analyzing thedata from the combustion chamber 106 to determine when and how to changeinjection and ignition characteristics from the injector 102. Theresults of the processing analysis can be stored in local memory 118 oran associated database 119.

According to additional features of the illustrated embodiment, thesystem 100 also includes a fuel source or fuel storage 120 that isoperably coupled to the injector 102 to deliver fuel and/or coolant tothe combustion chamber 106 via the injector 102. The fuel source 120 canstore or otherwise provide access to one or more fuels F and/or one ormore coolants C. Although the fuel source 120 is schematicallyillustrated with multiple fuels F and coolants C, one of ordinary skillin the art will appreciate that different fuels and/or coolants can bestored in separate containers. The fuel source 120 is also operablycoupled to the computer 116 and can optionally include one or moreprocessors 122 for selectively controlling the distribution of fuels Fand/or coolants C to the injector 102.

Operation of the system 100 is described in detail below with referenceto FIGS. 2A-2E. More specifically, FIGS. 2A-2E are a series of schematicdiagrams of a portion of the system 100 of FIG. 1 illustrating anoperational cycle including, for example, an intake stroke, acompression stroke, a power stroke, and an exhaust stroke. Referringfirst to FIG. 2A, FIG. 2A illustrates a direct-injection system 100during an intake stroke of the cycle. During the intake stroke, thepiston 108 begins at a top dead center (“TDC”) position where the piston108 creates a minimum volume of the combustion chamber (not shown inFIG. 2A). Fuel may be injected to produce a relatively homogeneouscharge as the piston 108 moves away from TDC to expand the volume of thecombustion chamber 106 (e.g., in the direction of arrow 232), the system100 draws intake air flow 230 into the combustion chamber 106.Production of a relatively stratified charge of combustible fuel and airmixture is provided by fuel injection during the compression and/orpower stroke that follows. More specifically, during the intake strokethe second valve 110 b remains closed and the first valve 110 a is atleast partially opened to allow the intake air flow 230 to enter thecombustion chamber 106 as the piston 108 moves away from TDC.

In certain embodiments, the system 100 is configured such that thevalves 110 maintain an ambient pressure or a positive pressure in thecombustion chamber 106 prior to a later combustion event. For instance,the system 100 can operate the intake stroke without throttling orotherwise impeding the intake air flow 230 into the combustion chamber106 such that a vacuum is not created in the combustion chamber 106during the intake stroke. Due to the ambient or positive pressure in thecombustion chamber 106, an excess oxidant can form an insulative barrieradjacent to the surfaces of the combustion chamber (e.g., the cylinderwalls, piston, engine head, etc.). As the piston 108 continues in thedirection of arrow 232 and approaches or reaches bottom dead center(“BDC”), which is when the piston 108 is at the bottom of its strokethereby resulting in a maximum volume of the combustion chamber 106, thefirst valve 110 a closes to seal the combustion chamber 106.

In certain embodiments, the system 100 can further be configured tointroduce fuel F into the combustion chamber 106 during the intake,compression, power, or exhaust strokes. For example, duringpredetermined operating conditions, such as a high load requirement or ahigh torque requirement, the injector 102 can dispense fuel F into thecombustion chamber 106 during the intake of the air flow 230. Moreover,when introducing the fuel F the injector 102 can introduce a layered orstratified charge of the fuel F, into the combustion chamber 106, aswell as other desired fuel distribution patterns and injectionfrequencies, as disclosed, for example, in the applications incorporatedby reference above. In certain embodiments, introducing the fuel F intothe combustion chamber 106 results in a homogenous air fuel mixture atcombustion. In still further embodiments, however, the system 100 canoperate such that the injector 102 meters fuel into the combustionchamber to produce a stratified charge during the compression and/orpower stroke of the piston 108.

Referring next to FIG. 2B, FIG. 2B illustrates the system 100 during acompression portion or compression stroke of the cycle. During thecompression stroke, the valves 110 are closed and the piston 108 movesaway from BDC toward TDC (e.g., in the direction of arrow 234). As thepiston 108 moves toward TDC, the piston 108 decreases the volume of thecombustion chamber 106 and accordingly increases the pressure within thecombustion chamber 106. In certain embodiments, during the compressionstroke the injector 102 can dispense fuel F into the combustion chamber106. For example, during predetermined operating conditions, such as forproduction of maximum fuel economy, particularly in conjunction with lowload or low torque requirements, the injector 102 can dispense the fuelF during the compression stroke of the piston 108. Moreover, theinjector 102 can dispense the fuel F in any desired distributionpattern, shape, stratified layers, etc., as noted above. As such, duringthe compression stroke the piston 108 can compress the air-fuel mixtureas the piston 108 reduces the volume of the cavity 106. In otherembodiments, however, the system 100 can operate such that the injector102 does not introduce fuel F into the combustion chamber 106 during thecompression stroke of the piston 108.

Referring next to FIG. 2C, as the piston 108 approaches or expands fromTDC the injector 102 generates one or more ignition events to ignite orotherwise initiate combustion of the air fuel combination in thecombustion chamber 106. For example, the injector 102 can include one ormore integrated ignition features (e.g., features for initiating aspark, plasma, or other suitable igniting event) as disclosed in theapplications incorporated by reference above. In certain embodiments,the injector 102 can generate the ignition event as the piston 108reaches TDC. In other embodiments, however, the injector 102 cangenerate the ignition event before the piston 108 reaches TDC and/orafter the piston 108 moves away from TDC.

Referring next to FIG. 2D, FIG. 2D illustrates the system 100 during apower portion or power stroke of the cycle, which is the source oftorque or power generated by the system 100. During the power stroke,the first and second valves 110 remain closed and the pressure resultingfrom the combustion of the compressed air fuel mixture forces the piston108 toward BDC in the direction indicated by arrow 232. According tofeatures of the illustrated embodiment, the injector 102 selectivelydispenses coolant C directly into the combustion chamber 106 during thepower stroke to cool the combustion chamber 106 or otherwise control orlimit the peak combustion temperature. As described in detail below,under circumstances where the injector 102 dispenses the coolant Cduring the power stroke, the system 100 can adaptively determine whichpower strokes the injector 102 will dispense the coolant C. For example,the system 100 may sense the temperature of combustion chambercomponents to determine that the injector 102 should dispense thecoolant C during every third power stroke during operation of the system100. In other embodiments, however, the system 100 may determine theneed to inject the coolant C more frequently (e.g., during each powerstroke or during every second power stroke) or less frequently (e.g.,during every fourth or greater power stroke). The determination of whento inject the coolant C can accordingly be adaptively determined andcontrolled based on the operating conditions of the system 100. In stillfurther embodiments, the determination of when to inject the coolant canbe correlating or otherwise determining the combustion chambertemperature to an acceleration of a power train component of the system,as described in U.S. patent application Ser. No. 12/804,508, titled“METHODS AND SYSTEMS FOR REDUCING THE FORMATION OF OXIDES OF NITROGENDURING COMBUSTION IN ENGINES,” filed Jul. 21, 2010, and incorporatedherein by reference in its entirety.

Although additional advantages of injecting the coolant C in accordancewith embodiments of the disclosure are discussed in detail below, oneadvantage of injecting the coolant C during the power stroke is theability to improve the volumetric efficiency and specific capacityrating of the combustion in the combustion chamber 106. For example,selectively cooling the combustion chamber 106 during the power strokeallows for more fuel to burn per cycle or unit time out of the samevolume in comparison with conventional high temperature conditions thatlimit the amount of fuel that burns. Allowing more fuel to burn duringthe power stroke accordingly provides more power output from the system.A corollary advantage is that the combustion chamber components become atype of thermal flywheel that provides rapid heating of the coolant C toproduce expansion and work to increase the net power production of theengine.

Referring next to FIG. 2E, FIG. 2E illustrates the system 100 during anexhaust portion or exhaust stroke of the cycle. During the exhauststroke, the first valve 110 a remains closed and the second valve 110 bopens and the piston 108 returns to TDC (e.g., in the direction of thearrow 234). As the piston 108 reduces the volume of the combustionchamber 106 with the second valve 110 b open, an exhaust air flow 236removes the combustion products from the combustion chamber 106.According to features of the illustrated embodiment, the injector 102can selectively dispense coolant C directly into the combustion chamber106 during the exhaust stroke to cool the combustion chamber 106 orotherwise control or limit the peak temperature of the combustionchamber 106. As described in detail below, under circumstances where theinjector 102 dispenses the coolant C during an exhaust stroke, thesystem 100 can adaptively determine which exhaust strokes the injector102 will dispense the coolant C. For example, the system 100 maydetermine that the injector 102 should dispense the coolant C duringevery third exhaust stroke during operation of the system 100. In otherembodiments, however, the system 100 may determine the need to injectthe coolant C more frequently (e.g., during each exhaust stroke orduring each second exhaust stroke) or less frequently (e.g., duringevery fourth or greater exhaust stroke). In still further embodiments,the injection of coolant C during an exhaust stroke can immediatelyfollow the injection of coolant C during a power stroke.

As explained above, systems configured in accordance with embodiments ofthe disclosure adaptively dispense coolant into the combustion chamberduring the power stroke and/or the exhaust stroke portions of the cycle.These systems, however, do not inject the coolant during the intakestroke and/or compression stroke portions of the cycle, although incertain embodiments these systems could be modified to inject coolantduring the intake stroke and/or compression stroke. Moreover, thesesystems can detect specific conditions that require injecting thecoolant during the power stroke and/or the exhaust stroke. In thismanner, these systems can adaptively or reactively control the timing ofthe coolant injection, the amount of injected coolant, the distributionpattern of injected coolant, etc. Moreover, the operating conditions caninclude, for example, the temperature in the combustion chamber as wellas other properties that can be correlated or that otherwise relate tothe combustion chamber temperature. Other factors that influence theadaptive control of the coolant injection can include the engine's powerdemand, type of coolant, coolant density, coolant viscosity, combustionchamber geometry including the piston geometry, resonance, pistonposition and speed, etc. An additional factor can include the amount ofsurplus air in the combustion chamber that forms an insulative envelopearound the combustion. For example, these systems can adaptively injectthe coolant in response to determining that an insufficient insulativesurplus air envelope exists in the combustion chamber thereby resultingin one or more quench regions in the combustion chamber. Moreover,although features of the embodiments described herein are described withreference to the intake, compression, power, and exhaust strokes orportions of a cycle, one of ordinary skill in the art will appreciatethat these strokes can be portions of four stroke or two stroke engines,in addition to other types of engines. Accordingly, embodiments of thepresent disclosure are not limited solely to engines that operate in afour stroke configuration.

Systems configured in accordance with embodiments of the disclosure thatselectively and adaptively cool the combustion chamber by injectioncoolant during a power or exhaust stroke provide several advantages. Oneadvantage, for example, is that the selective cooling improves thevolumetric efficiency of the air fuel charge, as well as the specificcapacity rating of the cycle. Additional benefits include preventingfouling of surfaces in the combustion chamber, as well as preventingpre-ignition of the fuel by reducing the operating temperatures.Moreover, such embodiments can eliminate parasitic losses resulting fromconventional cooling components of an engine. For example, a system orengine configured in accordance with embodiments of the disclosure mayeliminate the need for a radiator, water pump, water jacket, air pump,heat exchanger fins, or similar heat exchanging components thatotherwise draw energy from the system. In addition to eliminating theseparasitic energy losses, eliminating these or similar components reducesthe weight of the system, as well as the capital investment formanufacturing, sourcing, and installing these components along withelimination or reduction of associated failures and maintenance costs ofconventional cooling system components.

Additional benefits include increasing the longevity of the system, andin particular, increasing the longevity of components that areparticularly susceptible to wear and fatigue. For example, the selectivecooling during the power and/or exhaust strokes as disclosed herein canreduce the operating temperature of the piston, piston rings, oil, valveheads, engine head, etc. Moreover, the piston can reciprocate orotherwise operate in the combustion chamber at a higher frequency toburn more overall fuel resulting in greater power output of the engineunder high load conditions. Furthermore, and as noted above, the coolantcan be injected during the power and exhaust strokes without creatingfouling or other undesirable effects in the combustion chamber. Forexample, when the injector dispenses the coolant in a layered orstratified charge, an insulative layer of air in the combustion chambercan protect the surfaces of components in the combustion chamber.Another advantage resulting from embodiments of the present disclosureis the ability to limit the peak combustion chamber temperature to apredetermined value, such as 2200 degrees C. or less, for example, toavoid the formation of oxides of nitrogen. A further benefit of themethods and systems described herein is that they stop, or at leastreduce, the formation of oxides of nitrogen at the source (i.e., in thecombustion chamber), in contrast to conventional methods that focus oncleaning harmful emissions from the exhaust.

FIG. 3 is a schematic diagram of a system 300 configured in accordancewith another embodiment of the disclosure. The system 300 includesseveral features that are generally similar in structure and function tothe corresponding features of the system 100 described above withreference to FIGS. 1-2E. For example, the system 300 includes an engine301 with a piston 308 that moves relative to a combustion chamber 306through intake, compression, power, and exhaust events of two or fourstroke operation. For purposes of illustration, the system also includesone or more air flow valves 310 (identified individually as a first airflow valve 310 a and a second air flow valve 310 b) that are operable toallow air flow into and out of the combustion chamber 306. In theillustrated embodiment, however, the system 300 also includes aninjection and ignition subassembly 303. More specifically, thesubassembly 303 includes a first injector 302 a, a second injector 302b, and an igniter 305. In certain embodiments, the first injector 302 acan dispense a first fuel into the combustion chamber 306 and the secondinjector 302 b can dispense a coolant into the combustion chamber 306.Moreover, the igniter 305 can ignite the fuel and/or coolant that thefirst and second injectors 302 a, 302 b dispense into the combustionchamber 306. Although FIG. 3 illustrates the first injector 302 a, thesecond injector 302 b, and the igniter 305 as separate components, incertain embodiments one or more of these components can be integralparts of a single component. For example, the first injector 302 a andthe second injector 302 b can be a single injector separate from theigniter 305. In other embodiments, however, one of the first and secondinjectors 302 a, 302 b can be combined with the igniter 305 and separatefrom the corresponding first or second injector 302 a, 302 b. In stillfurther embodiments, the igniter 305 can be omitted from the system 300and the ignition can be compression based. In still further embodiments,the igniter 305 can be a glow plug or similar component to at leastpartially aid in a compression based ignition system.

FIG. 4 is a flow diagram of a routine or method 450 for cooling acombustion chamber of an engine in accordance with an embodiment of thedisclosure. The routine 450 can be controlled or performed by an enginemanagement computer, engine control unit (ECU),Application-Specific-Integrated-Circuit (ASIC), processor, computer,and/or other suitable programmable engine control device. The method 450can be used to cool a combustion chamber in which a piston or otherreciprocating energy transfer device moves through a cycle including anintake, compression, power, and exhaust stroke as generally describedabove. For example, the method 450 includes injecting fuel into acombustion chamber (block 452). As described in detail above withreference to FIGS. 1-2E, an integrated injector/igniter can dispense thefuel into the combustion chamber during the intake and/or compressionstrokes of the piston during a cycle. More specifically, for example,under high load or torque requirements the injector can dispense atleast a portion of the fuel into the combustion chamber during theintake stroke to develop a homogenous charge of fuel and air. At timesthat higher fuel economy is desired and/or under lower power or torquerequirements the injector can dispense the fuel during the compressionstroke in a stratified or layered pattern. The method 450 also includesgenerating an ignition event to ignite the fuel in the combustionchamber (block 454). In certain embodiments, the injector that dispensedthe fuel into the combustion chamber can also generate the ignitionevent to ignite the fuel. In other embodiments, however, a separateignition source can be used to ignite the fuel air charge in thecombustion chamber. Moreover, the ignition event can be generated as thepiston reaches TDC in the compression stroke, as well as before and/orafter the piston reaches TDC in the compression stroke.

The method 450 further includes monitoring a temperature of thecombustion chamber (block 456). Monitoring the temperature can include,for example, directly monitoring the temperature of the combustionchamber with one or more sensors carried by the injector or by othercomponents of the combustion chamber. In other embodiments, monitoringthe temperature of the combustion chamber can include detecting ormonitoring combustion chamber properties such as pressure, opticaland/or acoustical properties, etc. that can be correlated to thecombustion chamber temperature. The method 450 additionally includesdetermining if the combustion chamber temperature is at or above apredetermined value (decision block 458). In certain embodiments, forexample, it may be desirable to determine if the temperature in thecombustion chamber reaches 2200 degrees C., which is the threshold forforming oxides of nitrogen. In other embodiments, however, thepredetermined value of the temperature can be greater than or less than2200 degrees C.

When the system determines that the temperature is below or at thepredetermined value, the method includes continuing to operate throughthe intake, compression, power, and exhaust strokes of the cycle, andinjecting and igniting fuel as described above. However, when thecombustion chamber temperature is above or approaching the predeterminedvalue, the method further comprises adaptively introducing a coolantinto the combustion chamber during only one of a power stroke and/or anexhaust stroke of the cycle (block 460). The method can also includedispensing the coolant during the power stroke and/or the exhaust strokeif the system determines that the zone of combustion exceeds the surplusair insulation envelope and approaches a quench region. In certainembodiments, the injector that dispenses the fuel and/or that ignitesthe fuel can also dispense the coolant. As also noted above, the coolantcan include any fluid (e.g., gas or liquid) that produces cooling in thecombustion chamber by transferring heat away from components of thecombustion chamber. For example, the coolant can include non-combustingfluid. In other embodiments, however, the coolant can include a fuelthat ignites and/or combusts at a lower temperature than the fuel thatis introduced into the combustion chamber during the intake and/orcompression strokes. In still further embodiments, the coolant can be ahydrogenous (e.g., a hydrogen containing component) coolant.

In addition to adaptively injecting the coolant in response to thecombustion chamber temperature, the method 450 can also includeadaptively controlling a frequency of the bursts of coolant into thecombustion chamber. The method 450 can further include adaptivelycontrolling a distribution pattern or spray of the coolant into thecombustion chamber. For example, if the system determines that thecombustion chamber is approaching a temperature limit or a quench zoneor a portion of the combustion chamber that has a relatively highertemperature, the system can adaptively control the frequency, direction,amount, and/or pattern of the coolant distribution to target the regionof the elevated temperature. More specifically, several of the injectorsas described in the patent applications incorporated by reference abovedisclose features for adaptively actuating or controlling valves ofinjectors, which can be used in injectors according to embodiments ofthe present disclosure. After injecting the coolant into the combustionchamber to lower the peak temperature of combustion, and/or ofcombustion chamber components, the method 450 can return to block 452and repeat.

In still further embodiments, the method can include injecting thecoolant into the combustion chamber under predetermined conditions otherthan the combustion chamber temperature. For example, when an engine isunder a predetermined power load, such as a high power load or hightorque load resulting from rapid acceleration, towing, ascending a hill,etc., the method can include injecting the coolant during every powerstroke and/or exhaust stroke. Under relatively lower power or torqueloads the method can include injecting the coolant less frequently(e.g., during every fourth or greater power stroke).

2. Additional Embodiments of Systems and Methods for Adaptively CoolingCombustion Chambers

According to additional embodiments of the disclosure, a method ofcontrolling a temperature in a combustion chamber in an engine caninclude injecting coolant into the combustion chamber during a powerstroke and/or exhaust stroke during a predetermined operationalcondition of the engine. In these embodiments, for example, the coolantinjection can be based on the operational condition of the engine,rather than or in addition to the temperature of the combustion chamber.More specifically, a method of controlling a temperature in a combustionchamber can include introducing fuel into the combustion chamber of anengine, wherein an energy transfer device such as a rotor, piston, orother component moves at least partially within the combustion chamberthrough intake, compression, power, and exhaust events, and causing thefuel to combust in the combustion chamber. The method can furtherinclude monitoring the engine for a predefined operational condition ofthe engine. In certain embodiments, the predefined operational conditioncan include an increased power or torque requirement. For example, thepredefined operational condition can include accelerating, ascending ahill, towing a trailer or other load, and/or other high power or hightorque requirements. When the engine operates in the predefinedoperational condition, the method further includes introducing coolantinto the combustion chamber only during at least one of the power strokeand the exhaust stroke.

According to additional embodiments, the method can further includemonitoring a temperature of the combustions chamber in addition to theoperational condition of the engine, and when the temperature reaches apredetermined value, introducing coolant into the combustion chamberonly during at least one of the power stroke and the exhaust stroke.Moreover, introducing coolant into the combustion chamber can includeintroducing a coolant that does not combust in the combustion chamber.Furthermore, introducing fuel into the combustion chamber can includeintroducing fuel that generates a first temperature of combustion in thecombustion chamber, and introducing coolant into the combustion chambercan include introducing coolant that generates a second temperature ofcombustion in the combustion chamber, the second temperature being lessthan the first temperature. In addition, introducing coolant into thecombustion chamber can include introducing a coolant at least partiallycontaining hydrogen.

According to further embodiments of the present disclosure, methods andsystems can be directed to injecting a coolant or temperaturecontrolling fluid into the combustion chamber during a power strokeand/or exhaust stroke when the temperature is below an ideal operatingtemperature. For example, in certain situations, an ideal operatingtemperature of a combustion chamber may be less than a maximum operatingtemperature or other predefined maximum temperature, such as 2200degrees C., which is the threshold temperature for the formation ofoxides of nitrogen (NO_(x)). Although operating at or near 2200 degreesC. may be beneficial, in certain embodiments the operating temperaturecan be controlled to be lower for the purpose of obtaining more specificpower out of the engine by improving the volumetric efficiency andspecific capacity rating of the combustion in the combustion chamber.This control of the combustion chamber can be achieved by injecting thecoolant or other temperature controlling fluid only during the powerstroke and/or exhaust stroke.

FIG. 5 is a schematic diagram of a system 500 including a turbine 506configured in accordance with another embodiment of the disclosure. Theturbine 506 illustrated in FIG. 5 can be operated with a coolant ortemperature controlling fluid as disclosed above. More specifically, inthe illustrated embodiment the system 500 includes a fuel source 501that is coupled to an injector 502. The fuel source can store one ormore fuels and coolants. The injector 502 can include any of thefeatures described above, including the features of any of the injectorsdescribed in the applications incorporated herein by reference anddirected to adaptively injecting multiple fuels and/or coolants, as wellas igniting the fuels and coolants. For example, the injector 502 isconfigured to inject a fuel or coolant thereby generating an injectionevent 504 (e.g., injected fuel and/or coolant). In some embodiments, theinjection event 504 can also include ignition of the fuel and/or coolantthereby producing a combustion event.

In the illustrated embodiment, the turbine 506 includes multiple rotors510 and stators 512 (identified individually as first through sixthrotors 510 a, 510 b, 510 c, 510 d, and 510 f and first through fourthstators 512 a, 512 b, 512 c, and 512 d). The rotors 510 andcorresponding stators 512 are carried by a shaft 508 (e.g., drive shaft,output shaft, etc.) that can transfer rotational energy from the rotors510 during operation. The turbine 500 may be a stand-alone system thatdrives one or more loads such as a generator or compressor. In otherembodiments, the turbine 500 may be utilized, for example, as aturbocharger for another engine such as engine 100 or 300 as describedabove with reference to FIGS. 1-3.

For example, the injection event 504 can generate combustion that drivesor rotates the rotors 510. During operation, the rotors 510 or otherportions of the turbine 506 can develop hot or elevated temperaturesections that lead to inefficiencies of the turbine 506 and/or increasedor premature wear of components of the turbine 506. According toembodiments of the present disclosure, rather than injecting a fuel andigniting the fuel for the injection event 504, the injector 502 can beconfigured to inject a coolant or temperature controlling fluid directlyinto a hot section of one or more of the rotors 510. As described above,a coolant can include a combustible fuel or other fluid that ignites andcombusts at a lower temperature than other fuels that are used duringoperation. Accordingly, the direct injection of the coolant at or nearthe rotors 510 can provide beneficial and adaptive cooling of theturbine during operation for improved power output and increased rotor510 and other component wear.

In additional embodiments, the coolant that is introduced at the turbine506, and more specifically at the rotors 510, can include a coolant thatis exhausted from a combustion chamber of an internal combust chamber,including for example, the combustion chambers described above regardingoperation of engines 100 or 300. For example, in any of the embodimentsof combustions chambers described above with reference to FIGS. 1-4,exhaust from the combustion chamber can include excess air or excessfuel such as hydrogen, as well as other liquid and gaseous coolants.These exhaust coolants can be introduced into the turbine 506 when theturbine 506 is downstream or in a cascaded configuration with one ormore upstream combustion chambers. As such, exhaust coolants from acombustion chamber can accordingly be introduced into the hot sectionsof the turbine 506, including for example, at the rotors 510, to reduceoperating temperatures for improved performance and increased longevity.

FIG. 6 is a schematic diagram of a system 600 configured in accordancewith yet another embodiment of the disclosure. According to severalfeatures of the illustrated embodiment, the system 600 is configured forcooling one or more electrical generating or conditioning componentswith a coolant, and subsequently cooling a combustion chamber with thesame coolant via direct injection as described above with reference toFIGS. 1-4. For example, hybrid, electrical drive, and regenerative driveor braking systems can include several electricity generating componentssuch as alternators, transformers, batteries, electrical generators,fuel cells, etc. Similar to the embodiments described above, the coolantcan include any temperature controlling fluid or gas, including, forexample, hydrogen.

In the illustrated embodiment, the system 600 includes a coolant source601 coupled to an electrical generating component 604 via a coolantinlet conduit or line 602. The electrical generating component 604 caninclude one or more electrical circuits 606. The system 600 can furtherinclude a management clutch system 608 inline or coupled to the brakingand/or electrical generating component, as well as at least a portion ofan internal combustion engine 612 including one or more combustionchambers, energy transferring devices, injector, etc. as described abovewith reference to FIGS. 1-4. The management clutch system 608 isconfigured to manage or distribute power to one or more power outputcomponents of the system 600, and is intended to be representative of atleast one hybrid engine component that can benefit from the upstreamcooling from the electrical generating component 604 to the engine 612.The system 600 also includes a coolant delivery conduit, rail, or line610 fluidly coupled to the electrical generating component 604 and/orthe management clutch system 608. The coolant line 610 is also fluidlycoupled to the engine 612 to deliver the coolant from the electricalgenerating component 604 and/or the management clutch system 608 to theengine 612. The system 600 further includes an output shaft 614(portions of which are identified individually as 614A and 614B) thattransfers or delivers output energy from the electrical generatingcomponent 604 and/or engine 612 to an energy transfer component, such asone or more drive wheels 616 (identified individually as a first drivewheel 616A and a second drive wheel 616B). The clutch management system608 is configured to allow or manage various operational conditions ofthe drive wheels 616. For example, in certain embodiments, the clutchmanagement system 608 can allow for an electric drive and/or an engineon each of the drive wheels 616 to be at the same or at a different RPM,as well as for an electric drive to be on one of the drive wheels 616and an engine drive to be on the other drive wheel 616. The clutchmanagement system 608 can further allow or manage regenerative brakingby the electrical generating component 604 on either of the drive wheels616.

In operation, the electrical generating component 604 and/or themanagement clutch system 608 generate heat. As the temperature of thesecomponents increases or during other predetermined operationalconditions, the coolant inlet line 602 delivers coolant to theelectrical generating component 604 and/or the management clutch system608 to cool or otherwise control the operating temperature of thesecomponents. The coolant can circulate through or around thesecomponents, and then be delivered downstream to the engine 612 (or, forexample a turbine system such as the turbine 500 discussed above withreference to FIG. 5) via the coolant delivery line 610. At the engine612, the coolant can be injected as described above with reference toFIGS. 1-4, including, for example, only during at least one of theexhaust and power strokes of a piston moving relative to a combustionchamber, to thereby limit or control the operating temperature of theengine 612. The temperature of the coolant will still be sufficient forcooling or other temperature control in the engine 612 even aftercooling the electrical generating component 604 and/or the managementclutch system 608 due to the high operating temperatures of thecombustion chambers in the engine 612 (or of similar engines or theturbine 500 discussed above). As such, the engine 612 operates as a heatsink for the heat generating electrical components. Such configurationscan be useful, for example, in systems such as hybrid vehicles, vehicleswith fuel cells, vehicles with electrical generators, stationary engineswith electrical generators, etc.

FIG. 7 is a flow diagram of a method 700, such as a cascading method orcoolant recycling method, for cooling one or more electrical generatingcomponents and for cooling a combustion chamber of an engine inaccordance with embodiments of the disclosure. In the illustratedembodiment, the method 700 includes activating a system (block 702). Thesystem can include any suitable electrical generating componentsdescribed above with reference to FIG. 6. For example, and referring toFIG. 7, the system can include any electrical generating components thatare typically included in at least one of an electric drive system(block 704 a), a heat engine drive system (block 704 b), and/or anelectric and heat engine drive system (block 704 c), as well as othersuitable drive systems with electrical generating components. The method700 further includes circulating a coolant or temperature controllingfluid to one or more electric drive components or electrical generatingcomponents (block 706). In certain embodiments, circulating the coolantto one or more electric drive components can include circulating thecoolant to multiple electric drive components arranged in series or inparallel, thereby circulating the coolant in a cascading fashion betweenone or more electric drive components.

The method 700 further includes circulating or introducing the coolantinto a heat engine drive system (block 708). The heat engine drivesystem can include, for example, any internal combustion engine withenergy transferring components (e.g., two or four stroke piston engines,rotary combustion engines, gas turbine engines, and/or any combinationof these or other suitable engines). Moreover, the coolant that isintroduced into the heat engine drive system includes the same coolantthat previously circulated through the one or more electric drivecomponents upstream from the heat engine drive system. In certainembodiments, the method 700 can further include circulating the coolant(e.g., exhaust coolant) from the heat drive engine to one or moreadditional heat drive engines, electrical drive systems, and/orcombinations of heat drive and electrical drive engines (block 710).

From the foregoing, it will be appreciated that specific embodiments ofthe disclosure have been described herein for purposes of illustration,but that various modifications may be made without deviating from thespirit and scope of the disclosure. For example, the methods and systemsdescribed herein for combustion chamber cooling are applicable to avariety of fuel cells and/or engines including internal combustionengines such as rotary combustion engines, two-stroke and four-strokepiston engines, free-piston engines, etc. Moreover, these methods andsystems can provide for operation of such engines by insulation ofcombustion with surplus oxidant such as air to substantially achieveadiabatic combustion. In one embodiment, this can be achieved by firstfilling the combustion chamber with oxidant, and then adding fuel at thesame location that ignition occurs to provide one or more stratifiedcharges of fuel combustion within excess oxidant to minimize heattransfer to combustion chamber surfaces. Accordingly, the disclosure isnot limited except as by the appended claims.

To the extent not previously incorporated herein by reference, thepresent application incorporates by reference in their entirety thesubject matter of each of the following materials: U.S. PatentApplication No. 61/237,476, filed on Aug. 27, 2009 and titledELECTROLYZER AND ENERGY INDEPENDENCE TECHNOLOGIES; U.S. patentapplication Ser. No. 12/707,651, filed on Feb. 17, 2010 and titledELECTROLYTIC CELL AND METHOD OF USE THEREOF; U.S. Patent Application No.61/237,479, filed on Aug. 27, 2009 and titled FULL SPECTRUM ENERGY; U.S.Patent Application No. 61/178,442, filed on May 14, 2009 and titledENERGY INDEPENDENCE TECHNOLOGIES; U.S. patent application Ser. No.12/707,653, filed on Feb. 17, 2010 and titled APPARATUS AND METHOD FORCONTROLLING NUCLEATION DURING ELECTROLYSIS; U.S. patent application Ser.No. 12/707,656, filed on Feb. 17, 2010 and titled APPARATUS AND METHODFOR GAS CAPTURE DURING ELECTROLYSIS; U.S. patent application Ser. No.09/969,860, filed on Oct. 1, 2001 and titled METHOD AND APPARATUS FORSUSTAINABLE ENERGY AND MATERIALS; U.S. patent application Ser. No.12/857,553, filed on Aug. 16, 2010 and titled SUSTAINABLE ECONOMICDEVELOPMENT THROUGH INTEGRATED PRODUCTION OF RENEWABLE ENERGY, MATERIALSRESOURCES, AND NUTRIENT REGIMES, U.S. patent application Ser. No.12/857,541, filed on Aug. 16, 2010 and titled SYSTEMS AND METHODS FORSUSTAINABLE ECONOMIC DEVELOPMENT THROUGH INTEGRATED FULL SPECTRUMPRODUCTION OF RENEWABLE ENERGY; U.S. patent application Ser. No.12/857,554, filed on Aug. 16, 2010 and titled SYSTEMS AND METHODS FORSUSTAINABLE ECONOMIC DEVELOPMENT THROUGH INTEGRATED FULL SPECTRUMPRODUCTION OF RENEWABLE MATERIAL RESOURCES USING SOLAR THERMAL; U.S.patent application Ser. No. 12/857,502, filed on Aug. 16, 2010 andtitled ENERGY SYSTEM FOR DWELLING SUPPORT; U.S. patent application Ser.No. 13/027,235, filed on Feb. 14, 2011 and titled DELIVERY SYSTEMS WITHIN-LINE SELECTIVE EXTRACTION DEVICES AND ASSOCIATED METHODS OFOPERATION; and U.S. Patent Application No. 61/401,699, filed on Aug. 16,2010 and titled COMPREHENSIVE COST MODELING OF AUTOGENOUS SYSTEMS ANDPROCESSES FOR THE PRODUCTION OF ENERGY, MATERIAL RESOURCES AND NUTRIENTREGIMES.

I claim:
 1. A method of limiting a peak temperature of a combustionchamber in an engine, the method comprising: in a first portion of acycle of the engine— injecting fuel directly into the combustion chamberduring at least one of an intake stroke and a compression stroke of thefirst cycle; and igniting the fuel in the combustion chamber to causecombustion; monitoring a temperature of the combustion chamber resultingfrom the combustion; and in at least one of the first portion or asecond portion of the cycle of the engine— when the temperature reachesa predetermined value, injecting coolant directly into the combustionchamber only during at least one of a power stroke and an exhaust strokeof the cycle; wherein injecting fuel directly into the combustionchamber comprises injecting a first fuel that combusts at a firsttemperature of combustion in the combustion chamber; and whereininjecting the coolant directly into the combustion chamber comprisesinjecting a second fuel that combusts at a second temperature ofcombustion in the combustion chamber, wherein the second temperature isless than the first temperature.
 2. The method of claim 1 whereininjecting coolant directly into the combustion chamber comprisesinjecting a hydrogenous coolant directly into the combustion chamber. 3.The method of claim 1 wherein injecting coolant directly into thecombustion chamber comprises injecting coolant during each of the powerstroke and the exhaust stroke of the cycle.
 4. The method of claim 1wherein the predetermined value of the temperature is 2200 degrees C. 5.The method of claim 1 wherein: injecting fuel directly into thecombustion chamber comprising injecting fuel with an injector; andigniting the fuel in the combustion chamber comprises igniting the fuelwith an ignition feature carried by the injector.
 6. The method of claim1, further comprising: determining a predefined operational mode of theengine, the predefined operational mode comprising an acceleration orhigh load operational condition of the engine; and when the engineoperates in the predefined operational mode, injecting coolant directlyinto the combustion chamber only during at least one of the power strokeand an exhaust stroke of the cycle.
 7. A method of cooling a combustionchamber in an engine, the method comprising: introducing fuel into thecombustion chamber of the engine, wherein an energy transfer devicemoves at least partially within the combustion chamber through an intakestroke, a compression stroke, a power stroke, and an exhaust stroke;causing the fuel to combust in the combustion chamber; monitoring atemperature of the combustion chamber; and when the temperature reachesa predetermined value, introducing coolant into the combustion chamberonly during at least one of the power stroke and the exhaust stroke ofthe energy transfer device, wherein introducing coolant into thecombustion chamber comprises introducing a coolant that combusts in thecombustion chamber at a lower temperature than the fuel.
 8. The methodof claim 7 wherein: introducing the fuel into the combustion chambercomprising introducing the fuel with an injector; and causing the fuelto combust comprises generating an ignition event with an ignitionfeature carried by the injector.
 9. The method of claim 7 wherein:introducing the fuel into the combustion chamber comprising introducingthe fuel with an injector; and introducing coolant into the combustionchamber comprises introducing the coolant with the injector.
 10. Themethod of claim 9, further comprising: monitoring the engine for apredefined operational condition of the engine; and when the engineoperates in the predefined operational condition, introducing coolantinto the combustion chamber only during at least one of the power strokeand the exhaust stroke.
 11. An internal combustion engine systemcomprising: a combustion chamber; an energy transfer device movablerelative to the combustion chamber through a cycle comprising an intakestroke, a compression stroke, a power stroke, and an exhaust stroke; aninjector configured to inject fuel into the combustion chamber during atleast one of the intake stroke and the compression stroke; an ignitionfeature configured to ignite the fuel in the combustion chamber; and asensor configured to detect a temperature of the combustion chamber,wherein when the temperature reaches a predetermined value, the injectoris configured to inject coolant directly into the combustion chamberonly during at least one of the power stroke and the exhaust stroke;wherein the fuel that combusts at a first temperature of combustion inthe combustion chamber and wherein the coolant comprises a second fuelthat combusts at a second temperature of combustion in the combustionchamber less than the first temperature.
 12. The system of claim 11wherein the ignition feature is carried by the injector.
 13. The systemof claim 11 wherein the coolant at least partially contains hydrogen.14. The system of claim 11 wherein the predetermined value of thetemperature is 2200 degrees C.